[jira] [Created] (HDFS-3947) If there are multiple edit logs with the same fstime, Recovery Mode should load a different one than the normal loading process

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-3947:
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             Summary: If there are multiple edit logs with the same fstime, Recovery Mode should load a different one than the normal loading process
                 Key: HDFS-3947
                 URL: https://issues.apache.org/jira/browse/HDFS-3947
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 1.2.0
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor


If there are multiple edit logs with the same {{fstime}}, Recovery Mode should load a different one than the normal loading process.  This will protect against many common kinds of corruption which affect only one edit log directory.  For example, most I/O errors would fall into this category.

This improvement is not necessary in branch-2 and later branches because in those branches, we have edit log failover (See HDFS-3049).  However, this is an extremely simple and useful thing we can do to make Recovery Mode more helpful in branch-1.

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